Actually I think I'll go a little more into detail about the three abrasive families mentioned and where they differ.
The original Rubin was always a great all-rounder for wood. The new
Rubin 2 takes that, and furthers the design for wood applications, so you're spot on with your selection.
Brilliant 2 is a modified Rubin, essentially with an overlay anti-static, anti-clogging coating over the grits on the paper, exposing only the tips. What this does, is 1.) give you a shallower cut, less swirl marks, for an ultra fine finish, as well as 2.) better dust evacuation, with much shallower valleys between grits on the paper. As the name implies, Brilliant 2 will give you a brilliant finish, typically used for fine / ultra fine sanding.
Granat is a newer product, becoming available to the US market in 2012. Generally considered a magic bullet, Granat was initially developed for Festool Automotive System, specifically for Porsche paint, which uses low VOC paints which dries harder, naturally becoming much tougher on abrasives. Grant eventually found it's way into the woodworking catalog because of incredible cutting characteristics, exceptional dust evacuation properties, as well as very high durability of grit and paper. In Festool lab testing, Granat outlasts other papers by 2 to 1, becoming so effective that Festool has once considered altogether discontinuing most other families of abrasives. The grits for Granat are heat treated, and lower grits are comprised of aluminum oxide and ceramics which stay really sharp (when worn/chipped, the grit matrix sheer off in sharp angles). Higher grits continue use of heat treated aluminum oxide. The bonding agent is high-temp rated as well, and the Granat also shares the anti-static, anti-clogging, coating as the Brilliant 2. The Granat is a bit more expensive, but hey, premium product, premium price.
Hope this helps
